I have the same problem on a 2005 Fleetwood 39S - slight cold air draft and not enough heat pointed down at my feet. I bought a "T" fitting to cut into the heater hose in order to point hot air directly down at my feet, but the fitting was the wrong diameter for the heater hose. I need to keep looking.
If your MH home is like mine, in front of the gas peddle, there's a major 12VDC line coming in. I added an additional 6 place fuse block there. If I don't find the correct heater hose fitting, I'm going to install a very small 12VDC heater in front of my feet someplace to warm up that lower corner.
Let me know if you come up with a solution.
Bill